An ex-major breaks a safe-cracker out of jail to use as a guinea pig for an invisibility ray with hopes of eventually building an invisible army. Things go awry though when the safe-cracker develops his own plans. This movie was featured on Mystery Science Theater 3000 ep. 623. You can find out more about this movie on its IMDB page.
It's interesting and well acted, but the plot seems to just ignore basic physics and delves into imagination over reality when they make the absurd claim that an xray machine will detonate a contained of uranium like an atom bomb or for that matter make someone invisible.
If they had left out the nuclear material part and just made him a mad scientist of some sort then MAYBE, but we now have far to many people who work in radiology to try to pull the wool over that many peoples eyes these days.
All in all a well crafted movie, plot and good acting, but the ending leaves a bit to be desired.